Abstracts Brochure - CERN

THPCH — Poster Session 29-Jun-06 16:00 - 18:00
Experiments were carried out with a magnetron
gun having a cylindrical anode (70 mm in diameter): 1) with a smooth cathode (40 mm in diameter) and
a modified cathode; 2) with four longitudinal seams; and 3) composed of eight copper rods (5 mm in diameter).
Parameters of beams were studied and beam indentations were obtained. In the first case the beam formation occurs
with a current of ∼40 A (at a cathode voltage of 40 kV) and an azimuthal uniformity of ± 5%. In the second case, at a
field non-uniformity of ∼30%, the azimuthal non-uniformity is ∼15 A. In the third case, at a field non-uniformity of
∼60% there occurs formation of eight separate beams having the form close to the half-ring and with a total current
of ∼10A (at a cathode voltage of 30 kV). The beam current amplitude stability in all the cases was 2 . . . 5%.
Investigation of Electron Beam Parameters in Magnetron Guns at Reduced Voltages
The paper presents the results from investigations
into the generation of electron beams V. Zakutin, A. Dovbnya, N.G. Reshetnyak (NSC/KIPT)
and their parameters in magnetron guns
with secondary-emission cathodes. The beam parameters were investigated for two cases. In the first case the
magnetron gun cathode diameter was 40 mm, and the anode diameter was 70 mm. In the second case the magnetron
gun cathode diameter was 2 mm, and the anode diameter was 7 mm. The experiments have shown that in the first
case, with the anode diameter of 70 mm and the cathode voltage of 10 kV, the beam current was 7.5 A. The magnetic
field value was 600 Oe. At a cathode voltage of 6 kV the beam current was 3A; however, then the amplitude and the
triggering pulse decay rate should be increased to 100 kV/ms. In the second case at a pulse decay of ∼1200 kV/ms
and a cathode voltage of 7 kV, the beam current was 2 A at a magnetic field value of ∼3000 Oe. The beam current as
a function of the amplitude and the magnetic field distribution was studied.
Experimental, Test and Research Beamlines at Fermilab
Three new external beamlines are in operation
or under development at Fermilab: 1)
the Main Injector Particle Production (MIPP)
beamline, 2) the Mucool Test Area (MTA)
C. Johnstone, C.N. Brown, B. Choudhary, R.N. Coleman, M. De-
Marteau, C.D. Moore, R. Raja, I. Rakhno, E. Ramberg (Fermilab)
beamline, and 3) a new MTEST beamline for advanced detector work for high energy experiments and the ILC.
The MIPP beamline is a secondary production beamline capable of producing well-characterized beams of protons,
pions, and kaons from 5-120 GeV/c using 120 GeV/c protons from the Fermilab Main Injector. The second line is
a new primary 400-MeV proton beamline derived from the 400 MeV proton Linac which will provide for precision
measurements of Linac beam parameters in addition to a high-intensity primary test beam for development and
verification of muon ionization cooling apparatus. A dual mode operation will also provide accurate, dispersionfree
measurements of the Fermilab Linac beam properties with potential for diagnostic development. Installation is
planned in 2007. Finally, a third beam is also under design to provide secondary beams at ultra-low - high energies,
from ∼1 GeV/c to 90 GeV/c in addition to a primary 120-GeV proton mode of operation. It is anticipated that this
last line will be installed in fall of 2006.
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THPCH191
THPCH192